Reverse Snowflake Joins is a tool that parses SQL
Select statements and generates a diagram. In
addition to joins, the diagram shows parts of the
underlying SQL directly in the diagram. For
example x=30, GROUP BY (year), SUM(profit), HAVING
MIN(age) > 18.

mysqlviz renders a graphical representation of a MySQL database from a mysqldump file. Features include speed, the ability to infer foreign key relationships if you do not have them defined, and handling of partial dumps (i.e. foreign keys to tables that are not defined within the dump).

Build systems fail to scale to large projects when rebuilding a small portion requires stat-ing every project file. Prebake is a build system that uses a long-lived service to hook into the file-system and watch for changes so it can avoid unnecessary I/O for incremental builds. It also solves common problems with Ant and Make: missing dependencies and build cruft from deleted source files. It does away with missing dependencies by doing away with explicit dependencies altogether. Build dependencies are inferred by intersecting globs; if one product takes *.c and produces *.o, and another takes *.o and produces *.lib, then the latter depends on the former. Prebake also gets the benefits of both a declarative build syntax (a la make) and the flexibility of hand coded shell scripts. It uses tightly sandboxed JavaScript and "mobile functions" to get the flexibility of a scripting language with the hard controls on side effects that allow for repeatable builds. In practice, the JS in build files looks declarative, like JSON, but the dynamism is there when you need it.

pycdep is a tool for analyzing and visualizing C/C++ header file dependencies. A script extracts information about your code and dumps it in a Prolog database, which is used to query the dependency graph. It comes with a large number of predefined queries for finding out which files include or depend on which other files, how files depend on another file, circular dependencies, transitively implied dependencies, and design rule checks (limitations on which project can include from which other project). Visualization is supported by dumping graphs to .dot files. It also has the beginnings of a natural language interface.

openPLM is a Web-based Product Lifecycle Management (PLM) application. It provides a configuration management system that manages all kind of files and data as documents in a product structure. It supports documents, parts, BOMs, part-document links, electronic signatures for objects, revision management, check in and check out for all files, plain text search using the Xapian engine, navigation between objects using Graphviz, and user management that allows sponsorship, delegation, and rights. Plug-ins are available for Thunderbird, OpenOffice/LibreOffice, FreeCAD, and Gedit.

Theorem Linker is a program used to visualize references between theorems in a paper written using LaTeX. Using a .tex document (and a .aux file, created by the LaTeX compiler), Theorem Linker will search through a paper, find theorems, and find references to other theorems within a theorem's "proof". It will then create a digraph in a .dot file (to be opened with programs such as Graphviz or OmniGraffle) that will display each theorem as a node, with directed edges to describe the relations between the theorems. A path highlighted in red describes the longest path in the graph.
Theorem Linker will also create folders containing graphs to individually show relations of each theorem in a paper.

code2flow is an experimental script which sweeps through your project source code, looking for function definitions, then does another sweep, looking for where those functions are called. It connects the dots and presents you with a flowchart estimating the functional structure of your program. It is especially useful for untangling spaghetti code and getting new developers up to speed. code2flow is experimental and meant to provide a rough overview of the structure of simple projects. Source code which is just a little esoteric will break this. Even with normal code, there are many known limitations and many outright bugs.